chore(all): Release version 0.3.2

- Fix updating the notification causing another vibration
- Fix the "mark as read" intent being stuck

.metadata

@@ -18,6 +18,9 @@ migration:
     - platform: android
       create_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
       base_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
+    - platform: linux
+      create_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
+      base_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
 
   # User provided section
 

README.md

@@ -2,5 +2,32 @@
 
 Interactions with the system for Moxxy.
 
-This library is supposed to be the successor of moxplatform, featuring
+This library is the successor of moxplatform, featuring
 cleaner and more maintainable code.
+
+## Implementation Status
+
+### Android
+
+Everything works.
+
+### Linux
+
+Only creating the "background service" works. For everything else, we're waiting on
+[this Flutter issue](https://github.com/flutter/flutter/issues/73740), which would allow
+us to implement/stub the missing native APIs.
+
+## License
+
+See `./LICENSE`.
+
+## Special Thanks
+
+Thanks to [ekasetiawans](https://github.com/ekasetiawans) for [flutter_background_service](https://github.com/ekasetiawans/flutter_background_service), which
+was essentially the blueprint for the service and background service APIs. They were reimplemented
+to allow the root isolate to pass some additional data to the service, which `flutter_background_service`
+did not support.
+
+Thanks to [nschairer](https://github.com/nschairer) for [flutter_keyboard_height](https://github.com/nschairer/keyboard_height_plugin), which was the base for keeping track of the keyboard height.
+Due to having an issue with the height calculation if the Android device uses gesture navigation, I
+[forked the package](https://git.polynom.me/moxxy/keyboard_height_plugin) and modified the height calculation.

android/src/main/kotlin/org/moxxy/moxxy_native/Constants.kt

@@ -2,6 +2,12 @@ package org.moxxy.moxxy_native
 
 const val TAG = "moxxy_native"
 
+// The event channel name for the keyboard height
+const val KEYBOARD_HEIGHT_EVENT_CHANNEL_NAME = "org.moxxy.moxxyv2/keyboard_stream"
+
+// The event channel name for notification events
+const val NOTIFICATION_EVENT_CHANNEL_NAME = "org.moxxy.moxxyv2/notification_stream"
+
 // The size of buffers to use for various operations
 const val BUFFER_SIZE = 4096
 

android/src/main/kotlin/org/moxxy/moxxy_native/MoxxyNativePlugin.kt

@@ -25,10 +25,12 @@ import org.moxxy.moxxy_native.media.MediaImplementation
 import org.moxxy.moxxy_native.media.MoxxyMediaApi
 import org.moxxy.moxxy_native.notifications.MoxxyNotificationsApi
 import org.moxxy.moxxy_native.notifications.NotificationEvent
+import org.moxxy.moxxy_native.notifications.NotificationStreamHandler
 import org.moxxy.moxxy_native.notifications.NotificationsImplementation
 import org.moxxy.moxxy_native.picker.FilePickerType
 import org.moxxy.moxxy_native.picker.MoxxyPickerApi
 import org.moxxy.moxxy_native.picker.PickerResultListener
+import org.moxxy.moxxy_native.platform.KeyboardStreamHandler
 import org.moxxy.moxxy_native.platform.MoxxyPlatformApi
 import org.moxxy.moxxy_native.platform.PlatformImplementation
 import org.moxxy.moxxy_native.service.BackgroundService
@@ -36,23 +38,6 @@ import org.moxxy.moxxy_native.service.MoxxyServiceApi
 import org.moxxy.moxxy_native.service.PluginTracker
 import org.moxxy.moxxy_native.service.ServiceImplementation
 
-object MoxxyEventChannels {
-    var notificationChannel: EventChannel? = null
-    var notificationEventSink: EventChannel.EventSink? = null
-}
-
-object NotificationStreamHandler : EventChannel.StreamHandler {
-    override fun onListen(arguments: Any?, events: EventChannel.EventSink?) {
-        Log.d(TAG, "NotificationStreamHandler: Attached stream")
-        MoxxyEventChannels.notificationEventSink = events
-    }
-
-    override fun onCancel(arguments: Any?) {
-        Log.d(TAG, "NotificationStreamHandler: Detached stream")
-        MoxxyEventChannels.notificationEventSink = null
-    }
-}
-
 /*
  * Hold the last notification event in case we did a cold start.
  */
@@ -102,6 +87,14 @@ class MoxxyNativePlugin : FlutterPlugin, ActivityAware, ServiceAware, BroadcastR
             IntentFilter(SERVICE_FOREGROUND_METHOD_CHANNEL_KEY),
         )
 
+        // Special handling for the keyboard height
+        val keyboardChannel = EventChannel(flutterPluginBinding.getBinaryMessenger(), KEYBOARD_HEIGHT_EVENT_CHANNEL_NAME)
+        keyboardChannel?.setStreamHandler(KeyboardStreamHandler)
+
+        // Special handling from notification events
+        val notificationChannel = EventChannel(flutterPluginBinding.getBinaryMessenger(), NOTIFICATION_EVENT_CHANNEL_NAME)
+        notificationChannel?.setStreamHandler(NotificationStreamHandler)
+
         // Register the picker handler
         pickerListener = PickerResultListener(context!!)
         Log.d(TAG, "Attached to engine")
@@ -118,20 +111,24 @@ class MoxxyNativePlugin : FlutterPlugin, ActivityAware, ServiceAware, BroadcastR
     override fun onAttachedToActivity(binding: ActivityPluginBinding) {
         activity = binding.activity
         binding.addActivityResultListener(pickerListener)
+        KeyboardStreamHandler.activity = activity
         Log.d(TAG, "Attached to activity")
     }
 
     override fun onDetachedFromActivityForConfigChanges() {
         activity = null
+        KeyboardStreamHandler.activity = null
         Log.d(TAG, "Detached from activity")
     }
 
     override fun onReattachedToActivityForConfigChanges(binding: ActivityPluginBinding) {
         activity = binding.activity
+        KeyboardStreamHandler.activity = activity
     }
 
     override fun onDetachedFromActivity() {
         activity = null
+        KeyboardStreamHandler.activity = null
         Log.d(TAG, "Detached from activity")
     }
 

android/src/main/kotlin/org/moxxy/moxxy_native/content/MoxxyFileProvider.kt

@@ -1,6 +1,24 @@
 package org.moxxy.moxxy_native.content
 
+import android.content.Context
+import android.net.Uri
 import androidx.core.content.FileProvider
+import org.moxxy.moxxy_native.MOXXY_FILEPROVIDER_ID
 import org.moxxy.moxxy_native.R
+import java.io.File
 
-class MoxxyFileProvider : FileProvider(R.xml.file_paths)
+class MoxxyFileProvider : FileProvider(R.xml.file_paths) {
+    companion object {
+        /*
+         * Convert a path @path inside a sharable storage directory into a content URI, given
+         * the application's context @context.
+         * */
+        fun getUriForPath(context: Context, path: String): Uri {
+            return getUriForFile(
+                context,
+                MOXXY_FILEPROVIDER_ID,
+                File(path),
+            )
+        }
+    }
+}

android/src/main/kotlin/org/moxxy/moxxy_native/notifications/Helpers.kt

@@ -1,8 +1,6 @@
 package org.moxxy.moxxy_native.notifications
 
 import android.content.Intent
-import android.util.Log
-import org.moxxy.moxxy_native.TAG
 
 /*
  * Extract all user-added extra key-value pairs from @intent.
@@ -10,9 +8,7 @@ import org.moxxy.moxxy_native.TAG
 fun extractPayloadMapFromIntent(intent: Intent): Map<String?, String?> {
     val extras = mutableMapOf<String?, String?>()
     intent.extras?.keySet()!!.forEach {
-        Log.d(TAG, "Checking $it -> ${intent.extras!!.get(it)}")
         if (it.startsWith("payload_")) {
-            Log.d(TAG, "Adding $it")
             extras[it.substring(8)] = intent.extras!!.getString(it)
         }
     }

android/src/main/kotlin/org/moxxy/moxxy_native/notifications/NotificationReceiver.kt

@@ -15,7 +15,6 @@ import androidx.core.app.RemoteInput
 import androidx.core.content.FileProvider
 import org.moxxy.moxxy_native.MARK_AS_READ_ACTION
 import org.moxxy.moxxy_native.MOXXY_FILEPROVIDER_ID
-import org.moxxy.moxxy_native.MoxxyEventChannels
 import org.moxxy.moxxy_native.NOTIFICATION_EXTRA_ID_KEY
 import org.moxxy.moxxy_native.NOTIFICATION_EXTRA_JID_KEY
 import org.moxxy.moxxy_native.NOTIFICATION_MESSAGE_EXTRA_MIME
@@ -50,7 +49,7 @@ class NotificationReceiver : BroadcastReceiver() {
     }
 
     private fun handleMarkAsRead(context: Context, intent: Intent) {
-        MoxxyEventChannels.notificationEventSink?.success(
+        NotificationStreamHandler.sink?.success(
             NotificationEvent(
                 intent.getLongExtra(NOTIFICATION_EXTRA_ID_KEY, -1),
                 intent.getStringExtra(NOTIFICATION_EXTRA_JID_KEY)!!,
@@ -65,7 +64,7 @@ class NotificationReceiver : BroadcastReceiver() {
     private fun handleReply(context: Context, intent: Intent) {
         val remoteInput = RemoteInput.getResultsFromIntent(intent) ?: return
         val replyPayload = remoteInput.getCharSequence(REPLY_TEXT_KEY)
-        MoxxyEventChannels.notificationEventSink?.success(
+        NotificationStreamHandler.sink?.success(
             NotificationEvent(
                 intent.getLongExtra(NOTIFICATION_EXTRA_ID_KEY, -1),
                 intent.getStringExtra(NOTIFICATION_EXTRA_JID_KEY)!!,
@@ -164,8 +163,8 @@ class NotificationReceiver : BroadcastReceiver() {
         }
     }
 
-    fun handleTap(context: Context, intent: Intent) {
+    private fun handleTap(context: Context, intent: Intent) {
-        MoxxyEventChannels.notificationEventSink?.success(
+        NotificationStreamHandler.sink?.success(
             NotificationEvent(
                 intent.getLongExtra(NOTIFICATION_EXTRA_ID_KEY, -1),
                 intent.getStringExtra(NOTIFICATION_EXTRA_JID_KEY)!!,

android/src/main/kotlin/org/moxxy/moxxy_native/notifications/NotificationStreamHandler.kt

@@ -0,0 +1,22 @@
+package org.moxxy.moxxy_native.notifications
+
+import android.util.Log
+import io.flutter.plugin.common.EventChannel
+import org.moxxy.moxxy_native.TAG
+
+object NotificationStreamHandler : EventChannel.StreamHandler {
+    // The event sink to use for sending notification events to the service.
+    var sink: EventChannel.EventSink? = null
+
+    override fun onListen(arguments: Any?, events: EventChannel.EventSink?) {
+        // "register" the event sink
+        sink = events
+
+        Log.d(TAG, "NotificationStreamHandler: Attached stream")
+    }
+
+    override fun onCancel(arguments: Any?) {
+        sink = null
+        Log.d(TAG, "NotificationStreamHandler: Detached stream")
+    }
+}

android/src/main/kotlin/org/moxxy/moxxy_native/notifications/NotificationsImplementation.kt

@@ -14,10 +14,8 @@ import androidx.core.app.NotificationManagerCompat
 import androidx.core.app.Person
 import androidx.core.app.RemoteInput
 import androidx.core.app.TaskStackBuilder
-import androidx.core.content.FileProvider
 import androidx.core.graphics.drawable.IconCompat
 import org.moxxy.moxxy_native.MARK_AS_READ_ACTION
-import org.moxxy.moxxy_native.MOXXY_FILEPROVIDER_ID
 import org.moxxy.moxxy_native.NOTIFICATION_EXTRA_ID_KEY
 import org.moxxy.moxxy_native.NOTIFICATION_EXTRA_JID_KEY
 import org.moxxy.moxxy_native.NOTIFICATION_MESSAGE_EXTRA_MIME
@@ -27,7 +25,7 @@ import org.moxxy.moxxy_native.REPLY_ACTION
 import org.moxxy.moxxy_native.REPLY_TEXT_KEY
 import org.moxxy.moxxy_native.TAG
 import org.moxxy.moxxy_native.TAP_ACTION
-import java.io.File
+import org.moxxy.moxxy_native.content.MoxxyFileProvider
 
 class NotificationsImplementation(private val context: Context) : MoxxyNotificationsApi {
     override fun createNotificationGroups(groups: List<NotificationGroup>) {
@@ -96,7 +94,7 @@ class NotificationsImplementation(private val context: Context) : MoxxyNotificat
             context.applicationContext,
             0,
             replyIntent,
-            PendingIntent.FLAG_MUTABLE,
+            PendingIntent.FLAG_MUTABLE or PendingIntent.FLAG_UPDATE_CURRENT,
         )
         val replyAction = NotificationCompat.Action.Builder(
             R.drawable.reply,
@@ -115,13 +113,14 @@ class NotificationsImplementation(private val context: Context) : MoxxyNotificat
 
             notification.extra?.forEach {
                 putExtra("payload_${it.key}", it.value)
+                Log.d(TAG, "Adding payload_${it.key} -> ${it.value}")
             }
         }
         val markAsReadPendingIntent = PendingIntent.getBroadcast(
             context.applicationContext,
             0,
             markAsReadIntent,
-            PendingIntent.FLAG_IMMUTABLE,
+            PendingIntent.FLAG_IMMUTABLE or PendingIntent.FLAG_UPDATE_CURRENT,
         )
         val markAsReadAction = NotificationCompat.Action.Builder(
             R.drawable.mark_as_read,
@@ -207,11 +206,7 @@ class NotificationsImplementation(private val context: Context) : MoxxyNotificat
             )
             // If we got an image, turn it into a content URI and set it
             if (message.content.mime != null && message.content.path != null) {
-                val fileUri = FileProvider.getUriForFile(
+                val fileUri = MoxxyFileProvider.getUriForPath(context, message.content.path)
-                    context,
-                    MOXXY_FILEPROVIDER_ID,
-                    File(message.content.path),
-                )
                 msg.apply {
                     setData(message.content.mime, fileUri)
 
@@ -256,7 +251,7 @@ class NotificationsImplementation(private val context: Context) : MoxxyNotificat
             setCategory(Notification.CATEGORY_MESSAGE)
 
             // Prevent no notification when we replied before
-            setOnlyAlertOnce(false)
+            setOnlyAlertOnce(true)
 
             // Automatically dismiss the notification on tap
             setAutoCancel(true)

android/src/main/kotlin/org/moxxy/moxxy_native/picker/MimeUtils.kt

@@ -0,0 +1,13 @@
+package org.moxxy.moxxy_native.picker
+
+object MimeUtils {
+    // A reverse-mapping of image mime types to their commonly used file extension.
+    val imageMimeTypesToFileExtension = mapOf(
+        "image/png" to ".png",
+        "image/apng" to ".apng",
+        "image/avif" to ".avif",
+        "image/gif" to ".gif",
+        "image/jpeg" to ".jpg",
+        "image/webp" to ".webp",
+    )
+}

android/src/main/kotlin/org/moxxy/moxxy_native/picker/PickerResultListener.kt

@@ -6,10 +6,11 @@ import android.content.Context
 import android.content.Intent
 import android.net.Uri
 import android.os.Build
-import android.provider.OpenableColumns
+import android.provider.MediaStore.Images
 import android.util.Log
 import io.flutter.plugin.common.PluginRegistry.ActivityResultListener
 import org.moxxy.moxxy_native.AsyncRequestTracker
+import org.moxxy.moxxy_native.BUFFER_SIZE
 import org.moxxy.moxxy_native.PICK_FILES_REQUEST
 import org.moxxy.moxxy_native.PICK_FILE_REQUEST
 import org.moxxy.moxxy_native.PICK_FILE_WITH_DATA_REQUEST
@@ -20,6 +21,26 @@ import java.io.IOException
 import java.io.InputStream
 import java.io.OutputStream
 
+/*
+ * Attempt to replace the file extension in @fileName with @newExtension. If @newExtension is null,
+ * then @fileName is returned verbatim.
+ * */
+private fun maybeReplaceExtension(fileName: String, newExtension: String?): String {
+    if (newExtension == null) {
+        return fileName
+    }
+
+    assert(newExtension[0] == '.')
+    val parts = fileName.split(".")
+    return if (parts.size == 1) {
+        "$fileName$newExtension"
+    } else {
+        // Split at the ".", join all but the list end together and append the new extension
+        val fileNameWithoutExtension = parts.subList(0, parts.size - 1).joinToString(".")
+        "$fileNameWithoutExtension$newExtension"
+    }
+}
+
 class PickerResultListener(private val context: Context) : ActivityResultListener {
     /*
      * Attempt to deduce the filename for the URI @uri.
@@ -29,10 +50,22 @@ class PickerResultListener(private val context: Context) : ActivityResultListene
     private fun queryFileName(context: Context, uri: Uri): String {
         var result: String? = null
         if (uri.scheme == "content") {
+            val projection = arrayOf(
+                Images.Media._ID,
+                Images.Media.MIME_TYPE,
+                Images.Media.DISPLAY_NAME,
+            )
             val cursor = context.contentResolver.query(uri, null, null, null, null)
             cursor.use { cursor ->
                 if (cursor != null && cursor.moveToFirst()) {
-                    result = cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME))
+                    val mimeType = cursor.getString(cursor.getColumnIndex(Images.Media.MIME_TYPE))
+                    val displayName = cursor.getString(cursor.getColumnIndex(Images.Media.DISPLAY_NAME))
+                    val fileExtension = MimeUtils.imageMimeTypesToFileExtension[mimeType]
+
+                    // Note: This is a workaround for the Dart image library failing to parse the file
+                    //       because displayName somehow is always ".jpg", which confuses image.
+                    result = maybeReplaceExtension(displayName, fileExtension)
+                    Log.d(TAG, "Returning $result as filename (MIME: $mimeType)")
                 }
             }
         }
@@ -51,7 +84,7 @@ class PickerResultListener(private val context: Context) : ActivityResultListene
         if (Build.VERSION.SDK_INT >= 33) {
             android.os.FileUtils.copy(input, output)
         } else {
-            val buffer = ByteArray(4096)
+            val buffer = ByteArray(BUFFER_SIZE)
             while (input.read(buffer).also {} != -1) {
                 output.write(buffer)
             }
@@ -94,7 +127,7 @@ class PickerResultListener(private val context: Context) : ActivityResultListene
         }
 
         val returnBuffer = mutableListOf<Byte>()
-        val readBuffer = ByteArray(4096)
+        val readBuffer = ByteArray(BUFFER_SIZE)
         try {
             val inputStream = context.contentResolver.openInputStream(data!!.data!!)!!
             while (inputStream.read(readBuffer).also {} != -1) {

android/src/main/kotlin/org/moxxy/moxxy_native/platform/KeyboardStreamHandler.kt

@@ -0,0 +1,72 @@
+package org.moxxy.moxxy_native.platform
+
+import android.app.Activity
+import android.graphics.Rect
+import android.util.Log
+import android.view.View
+import android.view.ViewTreeObserver
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+import io.flutter.plugin.common.EventChannel
+import org.moxxy.moxxy_native.TAG
+
+object KeyboardStreamHandler : EventChannel.StreamHandler {
+    // The currently active activity. Set by @MoxxyNativePlugin.
+    var activity: Activity? = null
+
+    // The current bottom inset.
+    private var bottomInset: Int = 0
+
+    // The current event sink to use for sending events to the UI.
+    private var sink: EventChannel.EventSink? = null
+
+    private fun handleKeyboardHeightCheck(rootView: View?) {
+        rootView?.viewTreeObserver?.addOnGlobalLayoutListener(object : ViewTreeObserver.OnGlobalLayoutListener {
+            override fun onGlobalLayout() {
+                val r = Rect()
+                rootView.getWindowVisibleDisplayFrame(r)
+
+                val screenHeight = rootView.height
+                // Also subtract the height of the bottom inset as the SafeArea with "bottom: false"
+                // allows us to draw under the bottom system bar, if it is there.
+                val keypadHeight = screenHeight - r.bottom - bottomInset
+
+                val displayMetrics = activity?.resources?.displayMetrics
+                val logicalKeypadHeight = keypadHeight / (displayMetrics?.density ?: 1f)
+
+                if (keypadHeight > screenHeight * 0.15) {
+                    sink?.success(logicalKeypadHeight.toDouble())
+                } else {
+                    sink?.success(0.0)
+                }
+            }
+        })
+    }
+
+    override fun onListen(arguments: Any?, events: EventChannel.EventSink?) {
+        // "register" the event sink
+        sink = events
+
+        val rootView = activity?.window?.decorView?.rootView
+        handleKeyboardHeightCheck(rootView)
+
+        if (rootView != null) {
+            ViewCompat.setOnApplyWindowInsetsListener(rootView!!) { _, windowInsets ->
+                val insets = windowInsets.getInsets(WindowInsetsCompat.Type.systemBars())
+                val triggerEvent = bottomInset != insets.bottom
+                bottomInset = insets.bottom
+
+                // Notify in case the inset changed
+                if (triggerEvent) handleKeyboardHeightCheck(rootView)
+
+                WindowInsetsCompat.CONSUMED
+            }
+        }
+        Log.d(TAG, "KeyboardStreamHandler: Attached stream")
+    }
+
+    override fun onCancel(arguments: Any?) {
+        sink = null
+        Log.d(TAG, "KeyboardStreamHandler: Detached stream")
+    }
+}

android/src/main/kotlin/org/moxxy/moxxy_native/platform/PlatformApi.kt

@@ -8,6 +8,8 @@ import io.flutter.plugin.common.BasicMessageChannel
 import io.flutter.plugin.common.BinaryMessenger
 import io.flutter.plugin.common.MessageCodec
 import io.flutter.plugin.common.StandardMessageCodec
+import java.io.ByteArrayOutputStream
+import java.nio.ByteBuffer
 
 private fun wrapResult(result: Any?): List<Any?> {
     return listOf(result)
@@ -41,17 +43,66 @@ class FlutterError(
     val details: Any? = null,
 ) : Throwable()
 
+/** Generated class from Pigeon that represents data sent in messages. */
+data class ShareItem(
+    val path: String? = null,
+    val mime: String,
+    val text: String? = null,
+
+) {
+    companion object {
+        @Suppress("UNCHECKED_CAST")
+        fun fromList(list: List<Any?>): ShareItem {
+            val path = list[0] as String?
+            val mime = list[1] as String
+            val text = list[2] as String?
+            return ShareItem(path, mime, text)
+        }
+    }
+    fun toList(): List<Any?> {
+        return listOf<Any?>(
+            path,
+            mime,
+            text,
+        )
+    }
+}
+
+@Suppress("UNCHECKED_CAST")
+private object MoxxyPlatformApiCodec : StandardMessageCodec() {
+    override fun readValueOfType(type: Byte, buffer: ByteBuffer): Any? {
+        return when (type) {
+            128.toByte() -> {
+                return (readValue(buffer) as? List<Any?>)?.let {
+                    ShareItem.fromList(it)
+                }
+            }
+            else -> super.readValueOfType(type, buffer)
+        }
+    }
+    override fun writeValue(stream: ByteArrayOutputStream, value: Any?) {
+        when (value) {
+            is ShareItem -> {
+                stream.write(128)
+                writeValue(stream, value.toList())
+            }
+            else -> super.writeValue(stream, value)
+        }
+    }
+}
+
 /** Generated interface from Pigeon that represents a handler of messages from Flutter. */
 interface MoxxyPlatformApi {
     fun getPersistentDataPath(): String
     fun getCacheDataPath(): String
     fun openBatteryOptimisationSettings()
     fun isIgnoringBatteryOptimizations(): Boolean
+    fun shareItems(items: List<ShareItem>, genericMimeType: String)
 
     companion object {
         /** The codec used by MoxxyPlatformApi. */
         val codec: MessageCodec<Any?> by lazy {
-            StandardMessageCodec()
+            MoxxyPlatformApiCodec
         }
 
         /** Sets up an instance of `MoxxyPlatformApi` to handle messages through the `binaryMessenger`. */
@@ -122,6 +173,26 @@ interface MoxxyPlatformApi {
                     channel.setMessageHandler(null)
                 }
             }
+            run {
+                val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.moxxy_native.MoxxyPlatformApi.shareItems", codec)
+                if (api != null) {
+                    channel.setMessageHandler { message, reply ->
+                        val args = message as List<Any?>
+                        val itemsArg = args[0] as List<ShareItem>
+                        val genericMimeTypeArg = args[1] as String
+                        var wrapped: List<Any?>
+                        try {
+                            api.shareItems(itemsArg, genericMimeTypeArg)
+                            wrapped = listOf<Any?>(null)
+                        } catch (exception: Throwable) {
+                            wrapped = wrapError(exception)
+                        }
+                        reply.reply(wrapped)
+                    }
+                } else {
+                    channel.setMessageHandler(null)
+                }
+            }
         }
     }
 }

android/src/main/kotlin/org/moxxy/moxxy_native/platform/PlatformImplementation.kt

@@ -5,6 +5,8 @@ import android.content.Intent
 import android.net.Uri
 import android.os.PowerManager
 import android.provider.Settings
+import androidx.core.app.ShareCompat
+import org.moxxy.moxxy_native.content.MoxxyFileProvider
 
 class PlatformImplementation(private val context: Context) : MoxxyPlatformApi {
     override fun getPersistentDataPath(): String {
@@ -27,4 +29,28 @@ class PlatformImplementation(private val context: Context) : MoxxyPlatformApi {
         val pm = context.getSystemService(PowerManager::class.java)
         return pm.isIgnoringBatteryOptimizations(context.packageName)
     }
+
+    override fun shareItems(items: List<ShareItem>, genericMimeType: String) {
+        // Empty lists make no sense
+        assert(items.isNotEmpty())
+
+        // Convert the paths to content URIs
+        val builder = ShareCompat.IntentBuilder(context).setType(genericMimeType)
+        for (item in items) {
+            assert(item.text == null && item.path != null || item.text != null && item.path == null)
+
+            if (item.text != null) {
+                builder.setText(item.text)
+            } else if (item.path != null) {
+                builder.addStream(MoxxyFileProvider.getUriForPath(context, item.path))
+            }
+        }
+
+        // We cannot just use startChooser() because then Android complains that we're not attached
+        // to an Activity. So, we just ask it to start a new one.
+        val intent = builder.createChooserIntent().apply {
+            addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+        }
+        context.startActivity(intent)
+    }
 }

example/android/build.gradle

@@ -26,6 +26,6 @@ subprojects {
     project.evaluationDependsOn(':app')
 }
 
-task clean(type: Delete) {
+tasks.register("clean", Delete) {
     delete rootProject.buildDir
 }

example/lib/main.dart

@@ -1,10 +1,10 @@
 // ignore_for_file: avoid_print
 import 'dart:io';
-import 'dart:typed_data';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:get_it/get_it.dart';
 import 'package:moxxy_native/moxxy_native.dart';
+import 'package:path/path.dart' as p;
 import 'package:permission_handler/permission_handler.dart';
 
 @pragma('vm:entrypoint')
@@ -50,6 +50,19 @@ class TestEvent extends BackgroundEvent {
 class MyAppState extends State<MyApp> {
   String? imagePath;
 
+  @override
+  void initState() {
+    super.initState();
+
+    const EventChannel('org.moxxy.moxxyv2/notification_stream')
+        .receiveBroadcastStream()
+        .listen(
+      (event) {
+        print('Keyboard height: ${event as double}');
+      },
+    );
+  }
+
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
@@ -127,6 +140,7 @@ class MyAppState extends State<MyApp> {
             TextButton(
               onPressed: () async {
                 // Create channel
+                if (Platform.isAndroid) {
                   await MoxxyNotificationsApi().createNotificationChannels(
                     [
                       NotificationChannel(
@@ -142,6 +156,7 @@ class MyAppState extends State<MyApp> {
                   );
 
                   await Permission.notification.request();
+                }
 
                 final srv = getForegroundService();
                 await srv.start(
@@ -161,7 +176,64 @@ class MyAppState extends State<MyApp> {
                   awaitable: false,
                 );
               },
-                child: const Text('Start foreground service')),
+              child: const Text('Start foreground service'),
+            ),
+            TextButton(
+              onPressed: () async {
+                // Pick a file and copy it into the internal storage directory
+                final mediaDir = Directory(
+                  p.join(
+                    await MoxxyPlatformApi().getPersistentDataPath(),
+                    'media',
+                  ),
+                );
+                if (!mediaDir.existsSync()) {
+                  await mediaDir.create(recursive: true);
+                }
+                final pickResult = await MoxxyPickerApi()
+                    .pickFiles(FilePickerType.image, true);
+                if (pickResult.isEmpty) return;
+
+                final shareItems = List<ShareItem>.empty(growable: true);
+                for (final result in pickResult) {
+                  final mediaDirPath = p.join(
+                    mediaDir.path,
+                    p.basename(result!),
+                  );
+                  await File(result).copy(mediaDirPath);
+
+                  shareItems.add(
+                    ShareItem(
+                      path: mediaDirPath,
+                      mime: 'image/jpeg',
+                    ),
+                  );
+                }
+
+                // Share with the system
+                await MoxxyPlatformApi().shareItems(
+                  shareItems,
+                  'image/*',
+                );
+              },
+              child: const Text('Share internal files'),
+            ),
+            TextButton(
+              onPressed: () async {
+                // Share with the system
+                await MoxxyPlatformApi().shareItems(
+                  [
+                    ShareItem(
+                      mime: 'text/plain',
+                      text: 'Hello World!',
+                    ),
+                  ],
+                  'text/*',
+                );
+              },
+              child: const Text('Share some text'),
+            ),
+            const TextField(),
           ],
         ),
       ),

example/linux/.gitignore

@@ -0,0 +1 @@
+flutter/ephemeral

example/linux/CMakeLists.txt

@@ -0,0 +1,138 @@
+# Project-level configuration.
+cmake_minimum_required(VERSION 3.10)
+project(runner LANGUAGES CXX)
+
+# The name of the executable created for the application. Change this to change
+# the on-disk name of your application.
+set(BINARY_NAME "moxxy_native_example")
+# The unique GTK application identifier for this application. See:
+# https://wiki.gnome.org/HowDoI/ChooseApplicationID
+set(APPLICATION_ID "org.moxxy.moxxy_native")
+
+# Explicitly opt in to modern CMake behaviors to avoid warnings with recent
+# versions of CMake.
+cmake_policy(SET CMP0063 NEW)
+
+# Load bundled libraries from the lib/ directory relative to the binary.
+set(CMAKE_INSTALL_RPATH "$ORIGIN/lib")
+
+# Root filesystem for cross-building.
+if(FLUTTER_TARGET_PLATFORM_SYSROOT)
+  set(CMAKE_SYSROOT ${FLUTTER_TARGET_PLATFORM_SYSROOT})
+  set(CMAKE_FIND_ROOT_PATH ${CMAKE_SYSROOT})
+  set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+  set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+  set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+  set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+
+# Define build configuration options.
+if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
+  set(CMAKE_BUILD_TYPE "Debug" CACHE
+    STRING "Flutter build mode" FORCE)
+  set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS
+    "Debug" "Profile" "Release")
+endif()
+
+# Compilation settings that should be applied to most targets.
+#
+# Be cautious about adding new options here, as plugins use this function by
+# default. In most cases, you should add new options to specific targets instead
+# of modifying this function.
+function(APPLY_STANDARD_SETTINGS TARGET)
+  target_compile_features(${TARGET} PUBLIC cxx_std_14)
+  target_compile_options(${TARGET} PRIVATE -Wall -Werror)
+  target_compile_options(${TARGET} PRIVATE "$<$<NOT:$<CONFIG:Debug>>:-O3>")
+  target_compile_definitions(${TARGET} PRIVATE "$<$<NOT:$<CONFIG:Debug>>:NDEBUG>")
+endfunction()
+
+# Flutter library and tool build rules.
+set(FLUTTER_MANAGED_DIR "${CMAKE_CURRENT_SOURCE_DIR}/flutter")
+add_subdirectory(${FLUTTER_MANAGED_DIR})
+
+# System-level dependencies.
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(GTK REQUIRED IMPORTED_TARGET gtk+-3.0)
+
+add_definitions(-DAPPLICATION_ID="${APPLICATION_ID}")
+
+# Define the application target. To change its name, change BINARY_NAME above,
+# not the value here, or `flutter run` will no longer work.
+#
+# Any new source files that you add to the application should be added here.
+add_executable(${BINARY_NAME}
+  "main.cc"
+  "my_application.cc"
+  "${FLUTTER_MANAGED_DIR}/generated_plugin_registrant.cc"
+)
+
+# Apply the standard set of build settings. This can be removed for applications
+# that need different build settings.
+apply_standard_settings(${BINARY_NAME})
+
+# Add dependency libraries. Add any application-specific dependencies here.
+target_link_libraries(${BINARY_NAME} PRIVATE flutter)
+target_link_libraries(${BINARY_NAME} PRIVATE PkgConfig::GTK)
+
+# Run the Flutter tool portions of the build. This must not be removed.
+add_dependencies(${BINARY_NAME} flutter_assemble)
+
+# Only the install-generated bundle's copy of the executable will launch
+# correctly, since the resources must in the right relative locations. To avoid
+# people trying to run the unbundled copy, put it in a subdirectory instead of
+# the default top-level location.
+set_target_properties(${BINARY_NAME}
+  PROPERTIES
+  RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/intermediates_do_not_run"
+)
+
+# Generated plugin build rules, which manage building the plugins and adding
+# them to the application.
+include(flutter/generated_plugins.cmake)
+
+
+# === Installation ===
+# By default, "installing" just makes a relocatable bundle in the build
+# directory.
+set(BUILD_BUNDLE_DIR "${PROJECT_BINARY_DIR}/bundle")
+if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
+  set(CMAKE_INSTALL_PREFIX "${BUILD_BUNDLE_DIR}" CACHE PATH "..." FORCE)
+endif()
+
+# Start with a clean build bundle directory every time.
+install(CODE "
+  file(REMOVE_RECURSE \"${BUILD_BUNDLE_DIR}/\")
+  " COMPONENT Runtime)
+
+set(INSTALL_BUNDLE_DATA_DIR "${CMAKE_INSTALL_PREFIX}/data")
+set(INSTALL_BUNDLE_LIB_DIR "${CMAKE_INSTALL_PREFIX}/lib")
+
+install(TARGETS ${BINARY_NAME} RUNTIME DESTINATION "${CMAKE_INSTALL_PREFIX}"
+  COMPONENT Runtime)
+
+install(FILES "${FLUTTER_ICU_DATA_FILE}" DESTINATION "${INSTALL_BUNDLE_DATA_DIR}"
+  COMPONENT Runtime)
+
+install(FILES "${FLUTTER_LIBRARY}" DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+  COMPONENT Runtime)
+
+foreach(bundled_library ${PLUGIN_BUNDLED_LIBRARIES})
+  install(FILES "${bundled_library}"
+    DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+    COMPONENT Runtime)
+endforeach(bundled_library)
+
+# Fully re-copy the assets directory on each build to avoid having stale files
+# from a previous install.
+set(FLUTTER_ASSET_DIR_NAME "flutter_assets")
+install(CODE "
+  file(REMOVE_RECURSE \"${INSTALL_BUNDLE_DATA_DIR}/${FLUTTER_ASSET_DIR_NAME}\")
+  " COMPONENT Runtime)
+install(DIRECTORY "${PROJECT_BUILD_DIR}/${FLUTTER_ASSET_DIR_NAME}"
+  DESTINATION "${INSTALL_BUNDLE_DATA_DIR}" COMPONENT Runtime)
+
+# Install the AOT library on non-Debug builds only.
+if(NOT CMAKE_BUILD_TYPE MATCHES "Debug")
+  install(FILES "${AOT_LIBRARY}" DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+    COMPONENT Runtime)
+endif()

example/linux/flutter/CMakeLists.txt

@@ -0,0 +1,88 @@
+# This file controls Flutter-level build steps. It should not be edited.
+cmake_minimum_required(VERSION 3.10)
+
+set(EPHEMERAL_DIR "${CMAKE_CURRENT_SOURCE_DIR}/ephemeral")
+
+# Configuration provided via flutter tool.
+include(${EPHEMERAL_DIR}/generated_config.cmake)
+
+# TODO: Move the rest of this into files in ephemeral. See
+# https://github.com/flutter/flutter/issues/57146.
+
+# Serves the same purpose as list(TRANSFORM ... PREPEND ...),
+# which isn't available in 3.10.
+function(list_prepend LIST_NAME PREFIX)
+    set(NEW_LIST "")
+    foreach(element ${${LIST_NAME}})
+        list(APPEND NEW_LIST "${PREFIX}${element}")
+    endforeach(element)
+    set(${LIST_NAME} "${NEW_LIST}" PARENT_SCOPE)
+endfunction()
+
+# === Flutter Library ===
+# System-level dependencies.
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(GTK REQUIRED IMPORTED_TARGET gtk+-3.0)
+pkg_check_modules(GLIB REQUIRED IMPORTED_TARGET glib-2.0)
+pkg_check_modules(GIO REQUIRED IMPORTED_TARGET gio-2.0)
+
+set(FLUTTER_LIBRARY "${EPHEMERAL_DIR}/libflutter_linux_gtk.so")
+
+# Published to parent scope for install step.
+set(FLUTTER_LIBRARY ${FLUTTER_LIBRARY} PARENT_SCOPE)
+set(FLUTTER_ICU_DATA_FILE "${EPHEMERAL_DIR}/icudtl.dat" PARENT_SCOPE)
+set(PROJECT_BUILD_DIR "${PROJECT_DIR}/build/" PARENT_SCOPE)
+set(AOT_LIBRARY "${PROJECT_DIR}/build/lib/libapp.so" PARENT_SCOPE)
+
+list(APPEND FLUTTER_LIBRARY_HEADERS
+  "fl_basic_message_channel.h"
+  "fl_binary_codec.h"
+  "fl_binary_messenger.h"
+  "fl_dart_project.h"
+  "fl_engine.h"
+  "fl_json_message_codec.h"
+  "fl_json_method_codec.h"
+  "fl_message_codec.h"
+  "fl_method_call.h"
+  "fl_method_channel.h"
+  "fl_method_codec.h"
+  "fl_method_response.h"
+  "fl_plugin_registrar.h"
+  "fl_plugin_registry.h"
+  "fl_standard_message_codec.h"
+  "fl_standard_method_codec.h"
+  "fl_string_codec.h"
+  "fl_value.h"
+  "fl_view.h"
+  "flutter_linux.h"
+)
+list_prepend(FLUTTER_LIBRARY_HEADERS "${EPHEMERAL_DIR}/flutter_linux/")
+add_library(flutter INTERFACE)
+target_include_directories(flutter INTERFACE
+  "${EPHEMERAL_DIR}"
+)
+target_link_libraries(flutter INTERFACE "${FLUTTER_LIBRARY}")
+target_link_libraries(flutter INTERFACE
+  PkgConfig::GTK
+  PkgConfig::GLIB
+  PkgConfig::GIO
+)
+add_dependencies(flutter flutter_assemble)
+
+# === Flutter tool backend ===
+# _phony_ is a non-existent file to force this command to run every time,
+# since currently there's no way to get a full input/output list from the
+# flutter tool.
+add_custom_command(
+  OUTPUT ${FLUTTER_LIBRARY} ${FLUTTER_LIBRARY_HEADERS}
+    ${CMAKE_CURRENT_BINARY_DIR}/_phony_
+  COMMAND ${CMAKE_COMMAND} -E env
+    ${FLUTTER_TOOL_ENVIRONMENT}
+    "${FLUTTER_ROOT}/packages/flutter_tools/bin/tool_backend.sh"
+      ${FLUTTER_TARGET_PLATFORM} ${CMAKE_BUILD_TYPE}
+  VERBATIM
+)
+add_custom_target(flutter_assemble DEPENDS
+  "${FLUTTER_LIBRARY}"
+  ${FLUTTER_LIBRARY_HEADERS}
+)

example/linux/flutter/generated_plugin_registrant.cc

@@ -0,0 +1,15 @@
+//
+//  Generated file. Do not edit.
+//
+
+// clang-format off
+
+#include "generated_plugin_registrant.h"
+
+#include <moxxy_native/moxxy_native_plugin.h>
+
+void fl_register_plugins(FlPluginRegistry* registry) {
+  g_autoptr(FlPluginRegistrar) moxxy_native_registrar =
+      fl_plugin_registry_get_registrar_for_plugin(registry, "MoxxyNativePlugin");
+  moxxy_native_plugin_register_with_registrar(moxxy_native_registrar);
+}

example/linux/flutter/generated_plugin_registrant.h

@@ -0,0 +1,15 @@
+//
+//  Generated file. Do not edit.
+//
+
+// clang-format off
+
+#ifndef GENERATED_PLUGIN_REGISTRANT_
+#define GENERATED_PLUGIN_REGISTRANT_
+
+#include <flutter_linux/flutter_linux.h>
+
+// Registers Flutter plugins.
+void fl_register_plugins(FlPluginRegistry* registry);
+
+#endif  // GENERATED_PLUGIN_REGISTRANT_

example/linux/flutter/generated_plugins.cmake

@@ -0,0 +1,24 @@
+#
+# Generated file, do not edit.
+#
+
+list(APPEND FLUTTER_PLUGIN_LIST
+  moxxy_native
+)
+
+list(APPEND FLUTTER_FFI_PLUGIN_LIST
+)
+
+set(PLUGIN_BUNDLED_LIBRARIES)
+
+foreach(plugin ${FLUTTER_PLUGIN_LIST})
+  add_subdirectory(flutter/ephemeral/.plugin_symlinks/${plugin}/linux plugins/${plugin})
+  target_link_libraries(${BINARY_NAME} PRIVATE ${plugin}_plugin)
+  list(APPEND PLUGIN_BUNDLED_LIBRARIES $<TARGET_FILE:${plugin}_plugin>)
+  list(APPEND PLUGIN_BUNDLED_LIBRARIES ${${plugin}_bundled_libraries})
+endforeach(plugin)
+
+foreach(ffi_plugin ${FLUTTER_FFI_PLUGIN_LIST})
+  add_subdirectory(flutter/ephemeral/.plugin_symlinks/${ffi_plugin}/linux plugins/${ffi_plugin})
+  list(APPEND PLUGIN_BUNDLED_LIBRARIES ${${ffi_plugin}_bundled_libraries})
+endforeach(ffi_plugin)

example/linux/main.cc

@@ -0,0 +1,6 @@
+#include "my_application.h"
+
+int main(int argc, char** argv) {
+  g_autoptr(MyApplication) app = my_application_new();
+  return g_application_run(G_APPLICATION(app), argc, argv);
+}

example/linux/my_application.cc

@@ -0,0 +1,104 @@
+#include "my_application.h"
+
+#include <flutter_linux/flutter_linux.h>
+#ifdef GDK_WINDOWING_X11
+#include <gdk/gdkx.h>
+#endif
+
+#include "flutter/generated_plugin_registrant.h"
+
+struct _MyApplication {
+  GtkApplication parent_instance;
+  char** dart_entrypoint_arguments;
+};
+
+G_DEFINE_TYPE(MyApplication, my_application, GTK_TYPE_APPLICATION)
+
+// Implements GApplication::activate.
+static void my_application_activate(GApplication* application) {
+  MyApplication* self = MY_APPLICATION(application);
+  GtkWindow* window =
+      GTK_WINDOW(gtk_application_window_new(GTK_APPLICATION(application)));
+
+  // Use a header bar when running in GNOME as this is the common style used
+  // by applications and is the setup most users will be using (e.g. Ubuntu
+  // desktop).
+  // If running on X and not using GNOME then just use a traditional title bar
+  // in case the window manager does more exotic layout, e.g. tiling.
+  // If running on Wayland assume the header bar will work (may need changing
+  // if future cases occur).
+  gboolean use_header_bar = TRUE;
+#ifdef GDK_WINDOWING_X11
+  GdkScreen* screen = gtk_window_get_screen(window);
+  if (GDK_IS_X11_SCREEN(screen)) {
+    const gchar* wm_name = gdk_x11_screen_get_window_manager_name(screen);
+    if (g_strcmp0(wm_name, "GNOME Shell") != 0) {
+      use_header_bar = FALSE;
+    }
+  }
+#endif
+  if (use_header_bar) {
+    GtkHeaderBar* header_bar = GTK_HEADER_BAR(gtk_header_bar_new());
+    gtk_widget_show(GTK_WIDGET(header_bar));
+    gtk_header_bar_set_title(header_bar, "moxxy_native_example");
+    gtk_header_bar_set_show_close_button(header_bar, TRUE);
+    gtk_window_set_titlebar(window, GTK_WIDGET(header_bar));
+  } else {
+    gtk_window_set_title(window, "moxxy_native_example");
+  }
+
+  gtk_window_set_default_size(window, 1280, 720);
+  gtk_widget_show(GTK_WIDGET(window));
+
+  g_autoptr(FlDartProject) project = fl_dart_project_new();
+  fl_dart_project_set_dart_entrypoint_arguments(project, self->dart_entrypoint_arguments);
+
+  FlView* view = fl_view_new(project);
+  gtk_widget_show(GTK_WIDGET(view));
+  gtk_container_add(GTK_CONTAINER(window), GTK_WIDGET(view));
+
+  fl_register_plugins(FL_PLUGIN_REGISTRY(view));
+
+  gtk_widget_grab_focus(GTK_WIDGET(view));
+}
+
+// Implements GApplication::local_command_line.
+static gboolean my_application_local_command_line(GApplication* application, gchar*** arguments, int* exit_status) {
+  MyApplication* self = MY_APPLICATION(application);
+  // Strip out the first argument as it is the binary name.
+  self->dart_entrypoint_arguments = g_strdupv(*arguments + 1);
+
+  g_autoptr(GError) error = nullptr;
+  if (!g_application_register(application, nullptr, &error)) {
+     g_warning("Failed to register: %s", error->message);
+     *exit_status = 1;
+     return TRUE;
+  }
+
+  g_application_activate(application);
+  *exit_status = 0;
+
+  return TRUE;
+}
+
+// Implements GObject::dispose.
+static void my_application_dispose(GObject* object) {
+  MyApplication* self = MY_APPLICATION(object);
+  g_clear_pointer(&self->dart_entrypoint_arguments, g_strfreev);
+  G_OBJECT_CLASS(my_application_parent_class)->dispose(object);
+}
+
+static void my_application_class_init(MyApplicationClass* klass) {
+  G_APPLICATION_CLASS(klass)->activate = my_application_activate;
+  G_APPLICATION_CLASS(klass)->local_command_line = my_application_local_command_line;
+  G_OBJECT_CLASS(klass)->dispose = my_application_dispose;
+}
+
+static void my_application_init(MyApplication* self) {}
+
+MyApplication* my_application_new() {
+  return MY_APPLICATION(g_object_new(my_application_get_type(),
+                                     "application-id", APPLICATION_ID,
+                                     "flags", G_APPLICATION_NON_UNIQUE,
+                                     nullptr));
+}

example/linux/my_application.h

@@ -0,0 +1,18 @@
+#ifndef FLUTTER_MY_APPLICATION_H_
+#define FLUTTER_MY_APPLICATION_H_
+
+#include <gtk/gtk.h>
+
+G_DECLARE_FINAL_TYPE(MyApplication, my_application, MY, APPLICATION,
+                     GtkApplication)
+
+/**
+ * my_application_new:
+ *
+ * Creates a new Flutter-based application.
+ *
+ * Returns: a new #MyApplication.
+ */
+MyApplication* my_application_new();
+
+#endif  // FLUTTER_MY_APPLICATION_H_

example/pubspec.lock

@@ -5,10 +5,10 @@ packages:
     dependency: transitive
     description:
       name: async
-      sha256: bfe67ef28df125b7dddcea62755991f807aa39a2492a23e1550161692950bbe0
+      sha256: "947bfcf187f74dbc5e146c9eb9c0f10c9f8b30743e341481c1e2ed3ecc18c20c"
       url: "https://pub.dev"
     source: hosted
-    version: "2.10.0"
+    version: "2.11.0"
   boolean_selector:
     dependency: transitive
     description:
@@ -21,10 +21,10 @@ packages:
     dependency: transitive
     description:
       name: characters
-      sha256: e6a326c8af69605aec75ed6c187d06b349707a27fbff8222ca9cc2cff167975c
+      sha256: "04a925763edad70e8443c99234dc3328f442e811f1d8fd1a72f1c8ad0f69a605"
       url: "https://pub.dev"
     source: hosted
-    version: "1.2.1"
+    version: "1.3.0"
   clock:
     dependency: transitive
     description:
@@ -37,10 +37,10 @@ packages:
     dependency: transitive
     description:
       name: collection
-      sha256: cfc915e6923fe5ce6e153b0723c753045de46de1b4d63771530504004a45fae0
+      sha256: "4a07be6cb69c84d677a6c3096fcf960cc3285a8330b4603e0d463d15d9bd934c"
       url: "https://pub.dev"
     source: hosted
-    version: "1.17.0"
+    version: "1.17.1"
   crypto:
     dependency: transitive
     description:
@@ -95,10 +95,10 @@ packages:
     dependency: transitive
     description:
       name: js
-      sha256: "5528c2f391ededb7775ec1daa69e65a2d61276f7552de2b5f7b8d34ee9fd4ab7"
+      sha256: f2c445dce49627136094980615a031419f7f3eb393237e4ecd97ac15dea343f3
       url: "https://pub.dev"
     source: hosted
-    version: "0.6.5"
+    version: "0.6.7"
   lints:
     dependency: transitive
     description:
@@ -119,10 +119,10 @@ packages:
     dependency: transitive
     description:
       name: matcher
-      sha256: "16db949ceee371e9b99d22f88fa3a73c4e59fd0afed0bd25fc336eb76c198b72"
+      sha256: "6501fbd55da300384b768785b83e5ce66991266cec21af89ab9ae7f5ce1c4cbb"
       url: "https://pub.dev"
     source: hosted
-    version: "0.12.13"
+    version: "0.12.15"
   material_color_utilities:
     dependency: transitive
     description:
@@ -135,10 +135,10 @@ packages:
     dependency: transitive
     description:
       name: meta
-      sha256: "6c268b42ed578a53088d834796959e4a1814b5e9e164f147f580a386e5decf42"
+      sha256: "3c74dbf8763d36539f114c799d8a2d87343b5067e9d796ca22b5eb8437090ee3"
       url: "https://pub.dev"
     source: hosted
-    version: "1.8.0"
+    version: "1.9.1"
   moxlib:
     dependency: transitive
     description:
@@ -153,15 +153,15 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "0.1.0"
+    version: "0.2.0"
   path:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: path
-      sha256: db9d4f58c908a4ba5953fcee2ae317c94889433e5024c27ce74a37f94267945b
+      sha256: "8829d8a55c13fc0e37127c29fedf290c102f4e40ae94ada574091fe0ff96c917"
       url: "https://pub.dev"
     source: hosted
-    version: "1.8.2"
+    version: "1.8.3"
   permission_handler:
     dependency: "direct main"
     description:
@@ -267,10 +267,10 @@ packages:
     dependency: transitive
     description:
       name: test_api
-      sha256: ad540f65f92caa91bf21dfc8ffb8c589d6e4dc0c2267818b4cc2792857706206
+      sha256: eb6ac1540b26de412b3403a163d919ba86f6a973fe6cc50ae3541b80092fdcfb
       url: "https://pub.dev"
     source: hosted
-    version: "0.4.16"
+    version: "0.5.1"
   typed_data:
     dependency: transitive
     description:
@@ -296,5 +296,5 @@ packages:
     source: hosted
     version: "2.1.4"
 sdks:
-  dart: ">=2.19.6 <3.0.0"
+  dart: ">=3.0.0-0 <4.0.0"
   flutter: ">=2.8.0"

example/pubspec.yaml

@@ -31,6 +31,7 @@ dependencies:
   permission_handler: ^10.4.5
   get_it: ^7.6.0
   logging: ^1.2.0
+  path: ^1.8.3
 
 dev_dependencies:
   flutter_test:

flake.nix

@@ -44,13 +44,16 @@
     ]);
     lib = pkgs.lib;
     pinnedJDK = pkgs.jdk17;
-    flutterVersion = pkgs.flutter37;
+    flutterVersion = pkgs.flutter;
   in {
     devShell = pkgs.mkShell {
       buildInputs = with pkgs; [
         # Android
         pinnedJDK sdk ktlint
 
+        # Linux
+        clang cmake gtk3 ninja pkg-config xz pcre2 glib
+
         # Flutter
         flutterVersion
 

lib/pigeon/background_service.g.dart

@@ -20,10 +20,10 @@ class MoxxyBackgroundServiceApi {
 
   Future<String> getExtraData() async {
     final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
-        'dev.flutter.pigeon.moxxy_native.MoxxyBackgroundServiceApi.getExtraData', codec,
+        'dev.flutter.pigeon.moxxy_native.MoxxyBackgroundServiceApi.getExtraData',
+        codec,
         binaryMessenger: _binaryMessenger);
-    final List<Object?>? replyList =
+    final List<Object?>? replyList = await channel.send(null) as List<Object?>?;
-        await channel.send(null) as List<Object?>?;
     if (replyList == null) {
       throw PlatformException(
         code: 'channel-error',
@@ -47,7 +47,8 @@ class MoxxyBackgroundServiceApi {
 
   Future<void> setNotificationBody(String arg_body) async {
     final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
-        'dev.flutter.pigeon.moxxy_native.MoxxyBackgroundServiceApi.setNotificationBody', codec,
+        'dev.flutter.pigeon.moxxy_native.MoxxyBackgroundServiceApi.setNotificationBody',
+        codec,
         binaryMessenger: _binaryMessenger);
     final List<Object?>? replyList =
         await channel.send(<Object?>[arg_body]) as List<Object?>?;
@@ -69,7 +70,8 @@ class MoxxyBackgroundServiceApi {
 
   Future<void> sendData(String arg_data) async {
     final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
-        'dev.flutter.pigeon.moxxy_native.MoxxyBackgroundServiceApi.sendData', codec,
+        'dev.flutter.pigeon.moxxy_native.MoxxyBackgroundServiceApi.sendData',
+        codec,
         binaryMessenger: _binaryMessenger);
     final List<Object?>? replyList =
         await channel.send(<Object?>[arg_data]) as List<Object?>?;
@@ -93,8 +95,7 @@ class MoxxyBackgroundServiceApi {
     final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
         'dev.flutter.pigeon.moxxy_native.MoxxyBackgroundServiceApi.stop', codec,
         binaryMessenger: _binaryMessenger);
-    final List<Object?>? replyList =
+    final List<Object?>? replyList = await channel.send(null) as List<Object?>?;
-        await channel.send(null) as List<Object?>?;
     if (replyList == null) {
       throw PlatformException(
         code: 'channel-error',

lib/pigeon/platform.g.dart

@@ -8,6 +8,60 @@ import 'dart:typed_data' show Float64List, Int32List, Int64List, Uint8List;
 import 'package:flutter/foundation.dart' show ReadBuffer, WriteBuffer;
 import 'package:flutter/services.dart';
 
+class ShareItem {
+  ShareItem({
+    this.path,
+    required this.mime,
+    this.text,
+  });
+
+  String? path;
+
+  String mime;
+
+  String? text;
+
+  Object encode() {
+    return <Object?>[
+      path,
+      mime,
+      text,
+    ];
+  }
+
+  static ShareItem decode(Object result) {
+    result as List<Object?>;
+    return ShareItem(
+      path: result[0] as String?,
+      mime: result[1]! as String,
+      text: result[2] as String?,
+    );
+  }
+}
+
+class _MoxxyPlatformApiCodec extends StandardMessageCodec {
+  const _MoxxyPlatformApiCodec();
+  @override
+  void writeValue(WriteBuffer buffer, Object? value) {
+    if (value is ShareItem) {
+      buffer.putUint8(128);
+      writeValue(buffer, value.encode());
+    } else {
+      super.writeValue(buffer, value);
+    }
+  }
+
+  @override
+  Object? readValueOfType(int type, ReadBuffer buffer) {
+    switch (type) {
+      case 128:
+        return ShareItem.decode(readValue(buffer)!);
+      default:
+        return super.readValueOfType(type, buffer);
+    }
+  }
+}
+
 class MoxxyPlatformApi {
   /// Constructor for [MoxxyPlatformApi].  The [binaryMessenger] named argument is
   /// available for dependency injection.  If it is left null, the default
@@ -16,7 +70,7 @@ class MoxxyPlatformApi {
       : _binaryMessenger = binaryMessenger;
   final BinaryMessenger? _binaryMessenger;
 
-  static const MessageCodec<Object?> codec = StandardMessageCodec();
+  static const MessageCodec<Object?> codec = _MoxxyPlatformApiCodec();
 
   Future<String> getPersistentDataPath() async {
     final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
@@ -120,4 +174,27 @@ class MoxxyPlatformApi {
       return (replyList[0] as bool?)!;
     }
   }
+
+  Future<void> shareItems(
+      List<ShareItem?> arg_items, String arg_genericMimeType) async {
+    final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
+        'dev.flutter.pigeon.moxxy_native.MoxxyPlatformApi.shareItems', codec,
+        binaryMessenger: _binaryMessenger);
+    final List<Object?>? replyList = await channel
+        .send(<Object?>[arg_items, arg_genericMimeType]) as List<Object?>?;
+    if (replyList == null) {
+      throw PlatformException(
+        code: 'channel-error',
+        message: 'Unable to establish connection on channel.',
+      );
+    } else if (replyList.length > 1) {
+      throw PlatformException(
+        code: replyList[0]! as String,
+        message: replyList[1] as String?,
+        details: replyList[2],
+      );
+    } else {
+      return;
+    }
+  }
 }

lib/src/service/background/isolate.dart

@@ -0,0 +1,53 @@
+import 'dart:convert';
+import 'dart:isolate';
+import 'dart:ui';
+import 'package:logging/logging.dart';
+import 'package:moxlib/moxlib.dart';
+import 'package:moxxy_native/src/service/background/base.dart';
+import 'package:moxxy_native/src/service/config.dart';
+import 'package:moxxy_native/src/service/datasender/types.dart';
+import 'package:uuid/uuid.dart';
+
+class IsolateBackgroundService extends BackgroundService {
+  IsolateBackgroundService(this._sendPort);
+  final SendPort _sendPort;
+  final ReceivePort receivePort = ReceivePort();
+
+  /// A logger.
+  final Logger _log = Logger('IsolateBackgroundService');
+
+  @override
+  Future<void> send(BackgroundEvent event, {String? id}) async {
+    final data = DataWrapper(
+      id ?? const Uuid().v4(),
+      event,
+    );
+
+    _sendPort.send(jsonEncode(data.toJson()));
+  }
+
+  @override
+  Future<void> init(
+    ServiceConfig config,
+  ) async {
+    // Ensure that the Dart executor is ready to use plugins
+    // NOTE: We're not allowed to use this here. Maybe reusing the RootIsolateToken
+    //       (See IsolateForegroundService) helps?
+    // WidgetsFlutterBinding.ensureInitialized();
+    DartPluginRegistrant.ensureInitialized();
+
+    // Register the channel for Foreground -> Service communication
+    receivePort.listen((data) async {
+      // TODO(Unknown): Maybe do something smarter like pigeon and use Lists instead of Maps
+      await config
+          .handleData(jsonDecode(data! as String) as Map<String, dynamic>);
+    });
+
+    // Start execution
+    _log.finest('Setup complete. Calling main entrypoint...');
+    await config.entrypoint(config.initialLocale);
+  }
+
+  @override
+  void setNotificationBody(String body) {}
+}

lib/src/service/datasender/isolate.dart

@@ -0,0 +1,15 @@
+import 'dart:convert';
+import 'dart:isolate';
+import 'package:moxlib/moxlib.dart';
+import 'package:moxxy_native/src/service/datasender/types.dart';
+
+class IsolateForegroundServiceDataSender
+    extends AwaitableDataSender<BackgroundCommand, BackgroundEvent> {
+  IsolateForegroundServiceDataSender(this._port);
+  final SendPort _port;
+
+  @override
+  Future<void> sendDataImpl(DataWrapper<JsonImplementation> data) async {
+    _port.send(jsonEncode(data.toJson()));
+  }
+}

lib/src/service/datasender/types.dart

@@ -1,8 +1,4 @@
-import 'dart:io';
 import 'package:moxlib/moxlib.dart';
-import 'package:moxxy_native/pigeon/service.g.dart';
-import 'package:moxxy_native/src/service/datasender/pigeon.dart';
-import 'package:moxxy_native/src/service/exceptions.dart';
 
 typedef ForegroundServiceDataSender
     = AwaitableDataSender<BackgroundCommand, BackgroundEvent>;
@@ -10,11 +6,3 @@ typedef ForegroundServiceDataSender
 abstract class BackgroundCommand implements JsonImplementation {}
 
 abstract class BackgroundEvent implements JsonImplementation {}
-
-ForegroundServiceDataSender getForegroundDataSender(MoxxyServiceApi api) {
-  if (Platform.isAndroid) {
-    return PigeonForegroundServiceDataSender(api);
-  } else {
-    throw UnsupportedPlatformException();
-  }
-}

lib/src/service/entrypoints/base.dart

@@ -0,0 +1,28 @@
+import 'dart:io';
+import 'package:moxxy_native/src/service/config.dart';
+import 'package:moxxy_native/src/service/entrypoints/isolate.dart';
+import 'package:moxxy_native/src/service/entrypoints/pigeon.dart';
+import 'package:moxxy_native/src/service/exceptions.dart';
+
+typedef PlatformEntrypointCallback = Future<void> Function(dynamic);
+
+ServiceConfig getServiceConfig(
+  HandleEventCallback srvHandleData,
+  HandleEventCallback uiHandleData,
+  String initialLocale,
+) {
+  PlatformEntrypointCallback entrypoint;
+  if (Platform.isAndroid) {
+    entrypoint = pigeonEntrypoint;
+  } else if (Platform.isLinux || Platform.isWindows || Platform.isMacOS) {
+    entrypoint = isolateEntrypoint;
+  } else {
+    throw UnsupportedPlatformException();
+  }
+
+  return ServiceConfig(
+    entrypoint,
+    srvHandleData,
+    initialLocale,
+  );
+}

lib/src/service/entrypoints/isolate.dart

@@ -0,0 +1,30 @@
+import 'dart:isolate';
+import 'package:flutter/services.dart';
+import 'package:get_it/get_it.dart';
+import 'package:moxxy_native/src/service/background/base.dart';
+import 'package:moxxy_native/src/service/background/isolate.dart';
+import 'package:moxxy_native/src/service/config.dart';
+
+@pragma('vm:entry-point')
+Future<void> isolateEntrypoint(dynamic parameters) async {
+  parameters as List<dynamic>;
+
+  final sendPort = parameters[0] as SendPort;
+  final config = ServiceConfig.fromString(parameters[1] as String);
+
+  // This allows us to use the root isolate's method channels.
+  // See https://medium.com/flutter/introducing-background-isolate-channels-7a299609cad8
+  BackgroundIsolateBinaryMessenger.ensureInitialized(
+    parameters[2] as RootIsolateToken,
+  );
+
+  // Set up the background service
+  final srv = IsolateBackgroundService(sendPort);
+  GetIt.I.registerSingleton<BackgroundService>(srv);
+
+  // Reply back with the new send port
+  sendPort.send(srv.receivePort.sendPort);
+
+  // Run the entrypoint
+  await srv.init(config);
+}

lib/src/service/entrypoints/pigeon.dart

@@ -8,7 +8,7 @@ import 'package:moxxy_native/src/service/config.dart';
 /// An entrypoint that should be used when the service runs
 /// in a new Flutter Engine.
 @pragma('vm:entry-point')
-Future<void> pigeonEntrypoint() async {
+Future<void> pigeonEntrypoint(dynamic _) async {
   // ignore: avoid_print
   print('androidEntrypoint: Called on new FlutterEngine');
 

lib/src/service/foreground/base.dart

@@ -3,6 +3,7 @@ import 'package:moxlib/moxlib.dart';
 import 'package:moxxy_native/src/service/config.dart';
 import 'package:moxxy_native/src/service/datasender/types.dart';
 import 'package:moxxy_native/src/service/exceptions.dart';
+import 'package:moxxy_native/src/service/foreground/isolate.dart';
 import 'package:moxxy_native/src/service/foreground/pigeon.dart';
 
 /// Wrapper API that is only available to the UI isolate.
@@ -40,6 +41,8 @@ ForegroundService getForegroundService() {
   if (_service == null) {
     if (Platform.isAndroid) {
       _service = PigeonForegroundService();
+    } else if (Platform.isLinux || Platform.isWindows || Platform.isMacOS) {
+      _service = IsolateForegroundService();
     } else {
       throw UnsupportedPlatformException();
     }

lib/src/service/foreground/isolate.dart

@@ -0,0 +1,98 @@
+import 'dart:async';
+import 'dart:convert';
+import 'dart:isolate';
+import 'dart:ui';
+import 'package:logging/logging.dart';
+import 'package:moxxy_native/src/service/config.dart';
+import 'package:moxxy_native/src/service/datasender/isolate.dart';
+import 'package:moxxy_native/src/service/datasender/types.dart';
+import 'package:moxxy_native/src/service/entrypoints/isolate.dart';
+import 'package:moxxy_native/src/service/foreground/base.dart';
+
+class IsolateForegroundService extends ForegroundService {
+  /// The port on which we receive data from the isolate.
+  final ReceivePort _receivePort = ReceivePort();
+
+  /// The port on which we send data to the isolate.
+  late final SendPort _sendPort;
+
+  /// A completer that indicates when _sendPort has been set.
+  /// For more notes, see the comment in [start].
+  Completer<void>? _sendPortCompleter = Completer<void>();
+
+  /// The data sender backing this class.
+  late final IsolateForegroundServiceDataSender _dataSender;
+
+  /// A logger.
+  final Logger _log = Logger('IsolateForegroundService');
+
+  @override
+  Future<void> attach(
+    HandleEventCallback handleData,
+  ) async {
+    _receivePort.asBroadcastStream().listen((data) async {
+      if (data is SendPort) {
+        // Set the send port.
+        _sendPort = data;
+
+        // Resolve the waiting future.
+        assert(
+          _sendPortCompleter != null,
+          '_sendPort should only be received once!',
+        );
+        _sendPortCompleter?.complete();
+        return;
+      }
+
+      await handleData(
+        jsonDecode(data! as String) as Map<String, dynamic>,
+      );
+    });
+  }
+
+  @override
+  Future<void> start(
+    ServiceConfig config,
+    HandleEventCallback uiHandleData,
+  ) async {
+    // Listen for events
+    await attach(uiHandleData);
+
+    await Isolate.spawn(
+      isolateEntrypoint,
+      [
+        _receivePort.sendPort,
+        config.toString(),
+        RootIsolateToken.instance!,
+      ],
+    );
+
+    // Wait for [_sendPort] to get set.
+    // The issue is that [_receivePort] provides a stream that only one listener can listen to.
+    // This means that we cannot do `await _receivePort.first`. To work around this, we just cram
+    // an approximation of `_receivePort.first` into the actual listener.
+    await _sendPortCompleter!.future;
+    _sendPortCompleter = null;
+
+    // Create the data sender
+    _dataSender = IsolateForegroundServiceDataSender(_sendPort);
+    _log.finest('Background service started...');
+  }
+
+  @override
+  Future<bool> isRunning() async => false;
+
+  @override
+  ForegroundServiceDataSender getDataSender() => _dataSender;
+
+  @override
+  Future<BackgroundEvent?> send(
+    BackgroundCommand command, {
+    bool awaitable = true,
+  }) {
+    return _dataSender.sendData(
+      command,
+      awaitable: awaitable,
+    );
+  }
+}

linux/CMakeLists.txt

@@ -0,0 +1,47 @@
+# The Flutter tooling requires that developers have CMake 3.10 or later
+# installed. You should not increase this version, as doing so will cause
+# the plugin to fail to compile for some customers of the plugin.
+cmake_minimum_required(VERSION 3.10)
+
+# Project-level configuration.
+set(PROJECT_NAME "moxxy_native")
+project(${PROJECT_NAME} LANGUAGES CXX)
+
+# This value is used when generating builds using this plugin, so it must
+# not be changed.
+set(PLUGIN_NAME "moxxy_native_plugin")
+
+# Define the plugin library target. Its name must not be changed (see comment
+# on PLUGIN_NAME above).
+#
+# Any new source files that you add to the plugin should be added here.
+add_library(${PLUGIN_NAME} SHARED
+  "moxxy_native_plugin.cc"
+)
+
+# Apply a standard set of build settings that are configured in the
+# application-level CMakeLists.txt. This can be removed for plugins that want
+# full control over build settings.
+apply_standard_settings(${PLUGIN_NAME})
+
+# Symbols are hidden by default to reduce the chance of accidental conflicts
+# between plugins. This should not be removed; any symbols that should be
+# exported should be explicitly exported with the FLUTTER_PLUGIN_EXPORT macro.
+set_target_properties(${PLUGIN_NAME} PROPERTIES
+  CXX_VISIBILITY_PRESET hidden)
+target_compile_definitions(${PLUGIN_NAME} PRIVATE FLUTTER_PLUGIN_IMPL)
+
+# Source include directories and library dependencies. Add any plugin-specific
+# dependencies here.
+target_include_directories(${PLUGIN_NAME} INTERFACE
+  "${CMAKE_CURRENT_SOURCE_DIR}/include")
+target_link_libraries(${PLUGIN_NAME} PRIVATE flutter)
+target_link_libraries(${PLUGIN_NAME} PRIVATE PkgConfig::GTK)
+
+# List of absolute paths to libraries that should be bundled with the plugin.
+# This list could contain prebuilt libraries, or libraries created by an
+# external build triggered from this build file.
+set(moxxy_native_bundled_libraries
+  ""
+  PARENT_SCOPE
+)

linux/include/moxxy_native/moxxy_native_plugin.h

@@ -0,0 +1,26 @@
+#ifndef FLUTTER_PLUGIN_MOXXY_NATIVE_PLUGIN_H_
+#define FLUTTER_PLUGIN_MOXXY_NATIVE_PLUGIN_H_
+
+#include <flutter_linux/flutter_linux.h>
+
+G_BEGIN_DECLS
+
+#ifdef FLUTTER_PLUGIN_IMPL
+#define FLUTTER_PLUGIN_EXPORT __attribute__((visibility("default")))
+#else
+#define FLUTTER_PLUGIN_EXPORT
+#endif
+
+typedef struct _MoxxyNativePlugin MoxxyNativePlugin;
+typedef struct {
+  GObjectClass parent_class;
+} MoxxyNativePluginClass;
+
+FLUTTER_PLUGIN_EXPORT GType moxxy_native_plugin_get_type();
+
+FLUTTER_PLUGIN_EXPORT void moxxy_native_plugin_register_with_registrar(
+    FlPluginRegistrar* registrar);
+
+G_END_DECLS
+
+#endif  // FLUTTER_PLUGIN_MOXXY_NATIVE_PLUGIN_H_

linux/moxxy_native_plugin.cc

@@ -0,0 +1,70 @@
+#include "include/moxxy_native/moxxy_native_plugin.h"
+
+#include <flutter_linux/flutter_linux.h>
+#include <gtk/gtk.h>
+#include <sys/utsname.h>
+
+#include <cstring>
+
+#define MOXXY_NATIVE_PLUGIN(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj), moxxy_native_plugin_get_type(), \
+                              MoxxyNativePlugin))
+
+struct _MoxxyNativePlugin {
+  GObject parent_instance;
+};
+
+G_DEFINE_TYPE(MoxxyNativePlugin, moxxy_native_plugin, g_object_get_type())
+
+// Called when a method call is received from Flutter.
+static void moxxy_native_plugin_handle_method_call(
+    MoxxyNativePlugin* self,
+    FlMethodCall* method_call) {
+  g_autoptr(FlMethodResponse) response = nullptr;
+
+  const gchar* method = fl_method_call_get_name(method_call);
+
+  if (strcmp(method, "getPlatformVersion") == 0) {
+    struct utsname uname_data = {};
+    uname(&uname_data);
+    g_autofree gchar *version = g_strdup_printf("Linux %s", uname_data.version);
+    g_autoptr(FlValue) result = fl_value_new_string(version);
+    response = FL_METHOD_RESPONSE(fl_method_success_response_new(result));
+  } else {
+    response = FL_METHOD_RESPONSE(fl_method_not_implemented_response_new());
+  }
+
+  fl_method_call_respond(method_call, response, nullptr);
+}
+
+static void moxxy_native_plugin_dispose(GObject* object) {
+  G_OBJECT_CLASS(moxxy_native_plugin_parent_class)->dispose(object);
+}
+
+static void moxxy_native_plugin_class_init(MoxxyNativePluginClass* klass) {
+  G_OBJECT_CLASS(klass)->dispose = moxxy_native_plugin_dispose;
+}
+
+static void moxxy_native_plugin_init(MoxxyNativePlugin* self) {}
+
+static void method_call_cb(FlMethodChannel* channel, FlMethodCall* method_call,
+                           gpointer user_data) {
+  MoxxyNativePlugin* plugin = MOXXY_NATIVE_PLUGIN(user_data);
+  moxxy_native_plugin_handle_method_call(plugin, method_call);
+}
+
+void moxxy_native_plugin_register_with_registrar(FlPluginRegistrar* registrar) {
+  MoxxyNativePlugin* plugin = MOXXY_NATIVE_PLUGIN(
+      g_object_new(moxxy_native_plugin_get_type(), nullptr));
+
+  g_autoptr(FlStandardMethodCodec) codec = fl_standard_method_codec_new();
+  g_autoptr(FlMethodChannel) channel =
+      fl_method_channel_new(fl_plugin_registrar_get_messenger(registrar),
+                            "moxxy_native",
+                            FL_METHOD_CODEC(codec));
+  fl_method_channel_set_method_call_handler(channel, method_call_cb,
+                                            g_object_ref(plugin),
+                                            g_object_unref);
+
+  g_object_unref(plugin);
+}

pigeon/platform.dart

@@ -10,6 +10,13 @@ import 'package:pigeon/pigeon.dart';
     ),
   ),
 )
+class ShareItem {
+  const ShareItem(this.path, this.mime, this.text);
+  final String? path;
+  final String mime;
+  final String? text;
+}
+
 @HostApi()
 abstract class MoxxyPlatformApi {
   String getPersistentDataPath();
@@ -19,4 +26,6 @@ abstract class MoxxyPlatformApi {
   void openBatteryOptimisationSettings();
 
   bool isIgnoringBatteryOptimizations();
+
+  void shareItems(List<ShareItem> items, String genericMimeType);
 }

pubspec.yaml

@@ -1,6 +1,6 @@
 name: moxxy_native
 description: Interactions with the system for Moxxy
-version: 0.1.0
+version: 0.3.2
 publish_to: https://git.polynom.me/api/packages/Moxxy/pub
 homepage: 
 
@@ -29,3 +29,5 @@ flutter:
       android:
         package: org.moxxy.moxxy_native
         pluginClass: MoxxyNativePlugin
+      linux:
+        pluginClass: MoxxyNativePlugin